<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            width: 500px;
            height: 500px;
            margin: 150px auto;
            position: relative;
            animation-name: box;
            transition-timing-function: linear;
            animation-iteration-count: infinite;
            animation-duration: 1.5s;
        }
        .left{
        width: 220px;
        height: 220px;
        border-radius: 100%;
        position: absolute;
        top: 58px;
        left: 65px;
        background-color: red;
        }
        .right{
            width: 220px;
            height: 220px;
            border-radius: 100%;
            position: absolute;
            top: 58px;
            left: 209px;
            background-color: red;
        }
        .center{
            width: 210px;
            height: 210px;
            position: absolute;
            top: 143px;
            left: 142px;
            transform: rotate(45deg);
            background-color: red;
        }
        @keyframes box{
            0%{
                transform: scale(0.1);
            }
            100%{
                transform: scale(1.3);
            }
        }
        .body{
            background-color: pink;
        }
    </style>
</head>
<body class="body">
    <div class="box">
        <dix class="left"></dix>
        <dix class="right"></dix>
        <dix class="center"></dix>
    </div>
</body>
</html>